segmentation
head, thorax, and abdomen, although the head and thorax can be joined to form a cephalothorax.
Only some arthropods have a cephalothorax, like for example the lobster. Other arthropods have functionally separate (or non-fused) head and thorax, like many insects.
The cephalothorax on some arthropods is a tagma, a functional grouping or fusing of segments effectively combining the head and thorax, such as you might see on a lobster (which still has a distinct abdomen). By contrast, many insects (also arthropoda) have a separate head and thorax.
the answer to that is "cephalothorax" which is a head and a thorax.
Fused segments in an arthropd are called tagmate and phenomenon is called tagmatization . Cephalothorax , Prosoa , meta soma etc. are tagmata .
the head and thorax
Not exactly, it has a cephalothorax, which is a head and thorax fused together.
Cephalothorax.
Cephalothorax.
The name for this is a 'cephalothorax' which just literally means head-thorax.
Head and Thorax (Arachnids have cephalothorax, ex: spiders and scorpions)